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//usr/lib/python2.4/test/test_fpformat.py
''' Tests for fpformat module Nick Mathewson ''' from test.test_support import run_unittest import unittest from fpformat import fix, sci, NotANumber StringType = type('') # Test the old and obsolescent fpformat module. # # (It's obsolescent because fix(n,d) == "%.*f"%(d,n) and # sci(n,d) == "%.*e"%(d,n) # for all reasonable numeric n and d, except that sci gives 3 exponent # digits instead of 2. # # Differences only occur for unreasonable n and d. <.2 wink>) class FpformatTest(unittest.TestCase): def checkFix(self, n, digits): result = fix(n, digits) if isinstance(n, StringType): n = repr(n) expected = "%.*f" % (digits, float(n)) self.assertEquals(result, expected) def checkSci(self, n, digits): result = sci(n, digits) if isinstance(n, StringType): n = repr(n) expected = "%.*e" % (digits, float(n)) # add the extra 0 if needed num, exp = expected.split("e") if len(exp) < 4: exp = exp[0] + "0" + exp[1:] expected = "%se%s" % (num, exp) self.assertEquals(result, expected) def test_basic_cases(self): self.assertEquals(fix(100.0/3, 3), '33.333') self.assertEquals(sci(100.0/3, 3), '3.333e+001') def test_reasonable_values(self): for d in range(7): for val in (1000.0/3, 1000, 1000.0, .002, 1.0/3, 1e10): for realVal in (val, 1.0/val, -val, -1.0/val): self.checkFix(realVal, d) self.checkSci(realVal, d) def test_failing_values(self): # Now for 'unreasonable n and d' self.assertEquals(fix(1.0, 1000), '1.'+('0'*1000)) self.assertEquals(sci("1"+('0'*1000), 0), '1e+1000') # This behavior is inconsistent. sci raises an exception; fix doesn't. yacht = "Throatwobbler Mangrove" self.assertEquals(fix(yacht, 10), yacht) try: sci(yacht, 10) except NotANumber: pass else: self.fail("No exception on non-numeric sci") def test_main(): run_unittest(FpformatTest) if __name__ == "__main__": test_main()